A suspect has been arrested and charged with two robberies in which victims were lured to Oakland by Craigslist ads and then held up, police said Thursday.

Cas Black, 19, was taken into custody last Friday in Berkeley. Alameda County prosecutors charged him with two counts of armed robbery. He is being held at Santa Rita Jail in Dublin in lieu of $150,000 bail.

Black placed ads on Craigslist, was contacted by the victims and then robbed them in Oakland when they arrived to purchase the items he was selling, police said. He was identified through Craigslist messages, said Officer Johnna Watson, an Oakland police spokeswoman.

Investigators are also investigating whether Black is responsible for other robberies from August to October.